Upgraded logstash 1.5 to 5.2, now it doesn't read

Hi everyone. I'm a bit of a newbie with logstash so I hope you could help me with this issue.
I have this customer who uses AWS Beanstalk and has logstash on those instances. They were using logstash 1.5 and I recently updated that to 5.2.

The input is the /var/log/messages file and I added the following output:

file {
path => "/tmp/logstash.out"
stdout {
codec => rubydebug

But logstash doesn't create the output file and I get no stdout output. I am writing test lines into the messages file (and it's updated quite frequently by the OS), so it's not a case of an untouched file.

I tried running logstash using initctl, and then tried /usr/share/logstash/bin/logstash -f logstash.conf -config.reload.automatic

EDIT: Also, the logs in /var/log/logstash aren't being written to. I set the log.level to debug but still nothing there, not even when I restart the logstash service, which I assume should be mentioned in the log.

I feel really lost here, I'd appreciate any help. Thanks,

Sounds like a permissions issue. Make sure the user that Logstash runs as has rwx permissions in /var/log/logstash.

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